What is the mixing ratio of high purity silicon powder?
The mix proportion design of silica fume concrete is mainly determined based on the design requirements and general concrete design methods such as the silica fume mixing method, the optimal content of silica fume, the optimal content of water reducing agent, and gravel adjustment.
1) High-purity silica fume mixing method: Silica fume is generally mixed with concrete in two ways: one is internal mixing, and the other is external mixing, used together with water-reducing agent. The internal mixing method uses silica fume instead of cement, uses an equal amount of silicon instead of an equal amount of cement, and partially uses 1 kg of silicon to replace 1 to 3 kg of cement. As a research, it is generally 5% to 30%, and the water dues are generally unchanged. . The external mixing method means that silica powder is mixed into the concrete like an admixture.
2) The optimal content of high-purity silica fume: The content of silica fume in concrete is too small and will not significantly improve the performance of the concrete. However, if the content is too high, the concrete will be too different, difficult to construct, suffer from large shrinkage and deformation, and have poor cold resistance. When incorporating silica fume, the optimal level must be found in order to obtain the best results. Generally speaking, the effect is more satisfactory if the content is within 10%. The titration of silicon is usually determined by selecting 3, 5, 7, 10% silicon, etc., based on the type of silica powder, cement used, and the properties of the aggregate, to form a concrete specimen, and draw an R-SF (strength-silicon content) curve. Sure. It is worth noting that the price of silicon powder is very high. Technical and economic indicators should be considered when determining the optimal content of silicon fume.
